'use strict'
const path = require('path')
const defaultSettings = require('./src/settings.js')

function resolve(dir) {
  return path.join(__dirname, dir)
}

const name = defaultSettings.title || 'vue Admin Template' // page title

// If your port is set to 80,
// use administrator privileges to execute the command line.
// For example, Mac: sudo npm run
// You can change the port by the following methods:
// port = 9528 npm run dev OR npm run dev --port = 9528
// 当我们运行npm run dev进行开发调试的时候,此时会加载执行.env.development文件内容
// 当我们运行npm run build:prod进行生产环境打包的时候,会加载执行.env.production文件内容
// 意思是运行不同命令每次只能跑其中一个文件.env文件[.env.development或者.env.production]

const port = process.env.port || process.env.npm_config_port || 9528 // dev port

// All configuration item explanations can be find in https://cli.vuejs.org/config/
module.exports = {
  /**
   * You will need to set publicPath if you plan to deploy your site under a sub path,
   * for example GitHub Pages. If you plan to deploy your site to https://foo.github.io/bar/,
   * then publicPath should be set to "/bar/".
   * In most cases please use '/' !!!
   * Detail: https://cli.vuejs.org/config/#publicpath
   */
  publicPath: '/',
  outputDir: 'dist',
  assetsDir: 'static',
  lintOnSave: process.env.NODE_ENV === 'development',
  productionSourceMap: false,
  // devServer配置第三方插件(vue-cli内置的webpack的包)
  devServer: {
    port: port,
    open: true,
    overlay: {
      warnings: false,
      errors: true
    },
    // before: require('./mock/mock-server.js')
    // vue-cli内置的webpack会依靠devServer服务器开启一个本地localhost服务器
    // proxy: {}内部要设置``代理跨域的配置``(设置本地localhost服务器对于其他地址服务器的映射)
    proxy: {
      // 当我们的本地的请求 有/api的时候，就会代理我们的请求地址向另外一个服务器发出请求
      // '/api'可以写多个'/api2','/api2'可以根据这样的前缀设置给不同服务器
      '/api': {
        // 跨域请求的地址
        // target: 'http://ihrm-java.itheima.net/',
        target: 'http://ihrm.itheima.net/',
        // 只有这个值为true的情况下 才表示开启跨域(只有设置这个才能让``本地licalhost``向``请求服务器地址``发送请求)
        changeOrigin: true
        // // 路径重写(按需使用)
        // pathRewrite: {
        //   // ``默认映射关系``会是这样 => localhost:8888/api/login  => www.baidu.com/api/login
        //   // 假设我们想把 localhost:8888/api/login 变成www.baidu.com/login 就需要这么做
        //   '^/api': ''// 讲``/api开头``替换成``空字符串``
        // 当然上方"/api"是每个请求都会带假的前缀;就是requset()带了一个假的的前缀；我们可以在这里将假的前缀替换成空字符串
        // }
      }
    }
  },
  configureWebpack: {
    // provide the app's title in webpack's name field, so that
    // it can be accessed in index.html to inject the correct title.
    name: name,
    resolve: {
      alias: {
        '@': resolve('src')
      }
    }
  },
  chainWebpack(config) {
    // it can improve the speed of the first screen, it is recommended to turn on preload
    config.plugin('preload').tap(() => [
      {
        rel: 'preload',
        // to ignore runtime.js
        // https://github.com/vuejs/vue-cli/blob/dev/packages/@vue/cli-service/lib/config/app.js#L171
        fileBlacklist: [/\.map$/, /hot-update\.js$/, /runtime\..*\.js$/],
        include: 'initial'
      }
    ])

    // when there are many pages, it will cause too many meaningless requests
    config.plugins.delete('prefetch')

    // set svg-sprite-loader
    config.module
      .rule('svg')
      .exclude.add(resolve('src/icons'))
      .end()
    config.module
      .rule('icons')
      .test(/\.svg$/)
      .include.add(resolve('src/icons'))
      .end()
      .use('svg-sprite-loader')
      .loader('svg-sprite-loader')
      .options({
        symbolId: 'icon-[name]'
      })
      .end()

    config
      .when(process.env.NODE_ENV !== 'development',
        config => {
          config
            .plugin('ScriptExtHtmlWebpackPlugin')
            .after('html')
            .use('script-ext-html-webpack-plugin', [{
            // `runtime` must same as runtimeChunk name. default is `runtime`
              inline: /runtime\..*\.js$/
            }])
            .end()
          config
            .optimization.splitChunks({
              chunks: 'all',
              cacheGroups: {
                libs: {
                  name: 'chunk-libs',
                  test: /[\\/]node_modules[\\/]/,
                  priority: 10,
                  chunks: 'initial' // only package third parties that are initially dependent
                },
                elementUI: {
                  name: 'chunk-elementUI', // split elementUI into a single package
                  priority: 20, // the weight needs to be larger than libs and app or it will be packaged into libs or app
                  test: /[\\/]node_modules[\\/]_?element-ui(.*)/ // in order to adapt to cnpm
                },
                commons: {
                  name: 'chunk-commons',
                  test: resolve('src/components'), // can customize your rules
                  minChunks: 3, //  minimum common number
                  priority: 5,
                  reuseExistingChunk: true
                }
              }
            })
          // https:// webpack.js.org/configuration/optimization/#optimizationruntimechunk
          config.optimization.runtimeChunk('single')
        }
      )
  }
}
